Spool



Dec. 27,1932. WLLS 1,892,356

SPOOL Filed Dec. 5, 1930 l atented Dec. 27, 1932 VfizLLLCE C. IEILLS, OF ROCKFORD, ILLT O S, ASEIGNSBI TQ J. L.

' material.

In making sheet metal spools of the character indicated, the common practice is to form the tubular body or core of the spool from a flat sheet of metal bent into tubular form and to apply heads to opposite ends of the core, which heads are formed from dislts of metal centrally apcrtured to receive the core ends and secured to such ends in interlocking relation. The object of the present invention is to provide a spool of improved construction such that the annular groove or crevice formed as an incident to the fastening of the heads onto the ends of the core shall be closed against the entry of wire thread wound upon the core and confined j the heads, to the end that such wire or thread shall not become wedged in such crevices.

In the accompanying drawing 1 have illustrated my invention i spools of two specifiv different but typical constructions. Of the drawin side elevat onal view illustrat- -i a spool of the character to wh on tle .nvention appertains.

Fig. 2 is a central longitudinal sectional view through one end of one form of spool embodying the invention.

Fig. 3 is a transverse sectional view taken approximately in the plane of line 33 of 2, with the outer portion of the head brolien away.

F 4 is a view similar to Fi 2 but showing the invention embodied in another specifically different construction.

Fig. 5 is a fragmentary transverse sectional view taken approximately in the plane of line 55 of Fig. 4.

The soool comprises in general a tubular body 7 formed from a flat sheet of metal rolled into tubular form and having heads 8 formed from separate sheets of metal and secured on opposite ends of the body or core 7. The heads 8 are customarily fastened onto the ends of the tubular core 7 through the atien filed December 5, 193.

Serial No. 503,183.

medium of a interlocking connection which may be varied as desired.

Referring now to F 2, the connection therein shown for fastening the head onto the end of the core comprises an annulus 9 formed integral with the e d of the core and curled outwardly and then inwardly in interlocking relation with a reversely bent flange 10 cleaning a central aperture in the head 8. lhe latt r. as is customary in spools of this has an outer p .zipheral curl 11 for or strengthening purposes.

It will be observed that with the form of connection shown Fig. 2 between the head and the end of the tubular core, an annular groove or crevice 12 is formed. 1 close this crevice at closely spaced intervals by means of a series of radial projections 13 preferably formed making indentations in the inner surface of the core substantially in the plane of the head 8. The projections 13 are so proportioned that when the connection is formed by the head and the core, the projections are pressed forcibly into the crevice so as to become wedged snugly therein, thus completely filling the crevice at such point. In forming the connection, the parts are customarily pressed between suitable dies (not shown), the inner one of which operates upon the projections 13 to produce the desired wedging effect, leaving an exposed flat surface substantially flush with the inner face of the head.

Preferably the indentations are made in the end of the core in advance of the assen bling operation, and are of such depth that the radial extent of the resulting projections 13 is slightly greater than the normal width of the crevice. Accordingly when the projections are pressed into the crevice, corresponding indentations are.formed in the flange 10 of the head, thus insuring that the projections will extend entirely across the normal width of the crevice and thus bridge the same, as indicated at 14: in Fig. 3.

It will also be observed that the projections 13 form in efiect radial shoulders against which the head is seated, thus lending increased strength to the connection between the parts.

In the construction shown in Fig. 4:, the head 8 is secured on the end of the tubular core 7 by means of a connection comprising an annulus 15 which in this instance is formed integral with the head, and an outwardly turned flange 16 on the end of the core is disposed within the annulus 15 in interlocking relation therewith. The annulus 15 has its outer peripheral edge formed integral with an axially offset flange 17 on the head, and the inner peripheral edge of the annulus is formed integral with an end closure plate 18 which is inset into the tubular core. The latter is shaped to provide an an nular shoulder in the "form of a head 19 which is engaged by the flange 17 of the head, said flange 17 being oilset in an axial direction a distance corresponding to the thickness of the bead.

In this instance a crevice 20 is formed by the periphery of the bead 19 and the head 8, and to close this crevice l provide a series of projections 21 struck radially outwardly from the periphery of the bead, as shown in Fig. In forming the connection between the head and tne core, the parts are in this instance also pressed between dies, and during the interlocking operation the projections 21 are squeezed or wedged snugly into the crevice 20 preferably forming slight indentations in too adjacent portion of the head as indicated at 22 in Fig. 5.

It will be observed that in both instances the annular groove or crevice formed by the tubular head and the core as an incident to fastening these parts together is etlectually closed at spaced intervals by a wedging projection of a radial length which is preferably slightly greater than the normal idth of the crevice. As a result when line wire or thread is wound compactly on the core the portion thereof which is found adjacent the heads of the. core is effectually prevented from becoming wedged in the crevice thus to avoid unwinding of the entire length of the strand material wound on the core.

1 claim as my invention:

1. A sheet metal spool comprising a tubular sheet metal core and a head formed from a separate sheet of metal and secured onto the end of the core in interlocking relation, with an annular crevice formed between the head and the core, and a series of radial projections on the core pressed snugly into said crevice so as to interrupt the continuity thereof.

2. A spool of the character set forth comprising a tubular body, a head having a central aperture therein for receiving the end of the body, said head and hot y being formed of sheet metal and having interlocking flanges for securing the parts together, with an annular crevice formed between the head and the body, and a plurality of radial projections formed in the end or the body and pressed into said crevice with the ends of the projections terminating radially beyond the normal width of the cre *ice.

3. A spool of the character set forth comprising a tubular bony, a head centrally apertured to receive the end of the body, said head and body being formed of sheet metal and having interlocking flanges for securing the parts together in perpendicular relation, with an annular crevice formed between the head and the periphery of the body, said body having a series of indentations forming radial projections, and said projections being pressed forcibly into said crevice and having fiat exposed faces substantially flush with the adjacent surface of the head.

4. A spool of the character set forth comprising a tubular sheet metal body having an annulus at one end curled outwardly, a head formed of sheet metal having a central aperture with a flange defining the apertured end curled reversely into .said annulus to secure the parts together in interlocking relation, said body having a plurality of radially extending projections therein pressed into interengaging relation to said flange on the head so to bridge the joint between the head and the body.

5. A spool of the character set forth comprising a tubular sheet metal body having an annular bead projecting radially outwardly near one end of the body, a sheet metal head having a central aperture with an axially oli set portion adjacent said aperture seated upon said head, means securing t is head and body together, and a plurality of projections on said head pressed into inter-engaging relation to the head adjacent the head so as to bric go the joint between the bead and the headr 6. A spool having a sheet metal core, a head also formed oi sheet metal and secured on the end of the core, with an annular crevice between the parts, and means pressed from the core bridging said crevice to interrupt the continuity thereof.

In testimony whereof, I have hereunto affixed my signature.

W ALLAGE C. MILLS. 

